Telecommunications giant, Optus found themselves in the firing line this morning as millions of Australians woke up to find themselves without access to the internet.
In what some are calling "an absolute failure", large parts of the country including Brisbane, Sydney, and Perth were left without Wi-Fi or broadband services.
Melbourne reported their entire train system and several of their hospitals had been affected by the outage. While trains were now running again, operators warned of delays.
"Train services have resumed across the Metro network after an earlier communications outage.
"There are major delays to all lines as we restore services with select alterations and cancellations," said Metro Trains.
Melbourne's North Health District issued a warning on Facebook that all of their phone lines were down.
"This includes phone lines into Northern Hospital Epping, Broadmeadows Hospital, Bundoora Centre, Craigieburn Centre, Kilmore District Hospital, and Victorian Virtual Emergency Department (VVED)," they wrote.
The Today Show's Tech expert, Trevor Long said today represented a major problem for companies.
"This is without question the biggest telco outage we have ever seen because it spans both home Wi-Fi and broadband.
"Businesses that rely on Optus for payments and communications, they will be crippled this morning," he told the show.
Optus released a statement shortly afterwards, claiming they were "working to identify the cause".
"Optus is aware of an issue that may be impacting some of our mobile and internet customers," the company told 9news.com.au.
They have also messaged customers to assure them they are doing everything they can, and will resolve the issue soon.
"We understand connectivity is important and we are working to restore services as a priority.
"We apologise for the inconvenience caused while we have the issue resolved," 9news.co.au reported them saying.
The Department of Home Affairs has confirmed that the outage was not the result of a cyber-security attack.
